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# Which of the following expressions is defined for all

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Director
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Which of the following expressions is defined for all [#permalink]

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01 Jun 2007, 00:37
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Which of the following expressions is defined for all integer values of z, such athat z^2 < 9?

z+1/z

z-4/z^2 - 4z + 4

18/z^2 - 4z - 5

none
1 only
2 only
3 only
2 and 3

corrected, thanks.

Last edited by ggarr on 01 Jun 2007, 01:47, edited 2 times in total.
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01 Jun 2007, 00:58
you made a mistake in choice II

http://www.gmatclub.com/phpbb/viewtopic.php?t=37505

Director
Joined: 13 Nov 2003
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01 Jun 2007, 02:40
Hi
since z can take values 2,1,0,-1,-2 and all of the expressions have z in denominator( division of 0 is not defined ) then z can not be 0 and ans is none
01 Jun 2007, 02:40
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